It's like a cross between Elastomania and Tony Hawk.
You ride a bike with colored wheels down a track of colored rails doing tricks along the way for a high score. The bike can freely rotate, double jump, and the wheels are magnetic and can cling to the underside of a rail as long as the jump button is held down. When your wheels touch a rail of the same color you get points, if you touch a white rail you survive but lose your multiplier, and if you touch the opposite color you die.